78310700163661 has 32 divisors (see below), whose sum is σ = 95066913143808. Its totient is φ = 62972381767680.

The previous prime is 78310700163649. The next prime is 78310700163733. The reversal of 78310700163661 is 16636100701387.

It is a happy number.

It is not a de Polignac number, because 78310700163661 - 2⁷ = 78310700163533 is a prime.

It is a super-2 number, since 2×78310700163661² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78310700160661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51761731 + ... + 53253151.

It is an arithmetic number, because the mean of its divisors is an integer number (2970841035744).

Almost surely, 2^{78310700163661} is an apocalyptic number.

It is an amenable number.

78310700163661 is a deficient number, since it is larger than the sum of its proper divisors (16756212980147).

78310700163661 is a wasteful number, since it uses less digits than its factorization.

78310700163661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492861.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 78310700163661 in words is "seventy-eight trillion, three hundred ten billion, seven hundred million, one hundred sixty-three thousand, six hundred sixty-one".